用ENZO计算宇宙辐射流体力学
Cosmological Radiation Hydrodynamics with ENZO
摘要：
我们描述了宇宙流体动力学代码ENZO的扩展，包括自洽传输的电离辐射模型的通量限制扩散近似。我们的算法的一个新功能是耦合的辐射输运，电离动力学和气体光加热的隐式解，使这部分的计算分辨率独立的时间步长。隐式系统通过算子分裂耦合到显式宇宙流体动力学方程，并用可伸缩多重网格方法求解。总结了数值计算方法，给出了对宇宙学Stromgren球的验证，并将其应用于宇宙学氢再电离问题。
英文摘要：
We describe an extension of the cosmological hydrodynamics code ENZO to include the self-consistent transport of ionizing radiation modeled in the flux-limited diffusion approximation. A novel feature of our algorithm is a coupled implicit solution of radiation transport, ionization kinetics, and gas photoheating, making the timestepping for this portion of the calculation resolution independent. The implicit system is coupled to the explicit cosmological hydrodynamics through operator splitting and solved with scalable multigrid methods. We summarize the numerical method, present a verification test on cosmological Stromgren spheres, and then apply it to the problem of cosmological hydrogen reionization.
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